Magnetic inductor.



PATENTED AUG. 4, 1908.

- M. FISCHER. MAGNETIC INDUOTOR. APPLICATION FILED SEPT.26,1904

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'nrurnn MARTIN FISCHER, OF ZURICH, SWITZERLAND.

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Specification oi Letters Patent.

. Patented Aug. 4;, IQOS.

Application filed September 26, 1904. Serial No. 226,032.

To all whom it mayronccrn:

Be it known that I, MARTIN Frsonnn, a "citizen of the Republic of Switzerland, re-

siding at Zurich, in Switzerland, have in vented new and useful Improvements in Magnetic Inductors, of which the following is a specification.

The present invention vrelates to a n1agnetic inductor having afixed coil. 1 The invention has i or its object to provide a magnetic inductorwhich shall have an increased 'eificiency and be of simple construction and can be constructed both with a rotary as also with an oscillating armature.

With this object the armature is constructed in such a manner that the armature core is mounted in the coil in such a manner as to be capable of rotating or oscillating about the axis of the coil, while the pole pieces of the armature extending from the ends of the core,

are carried over the front ends of the coil and I -magnetic inductor having a rotary armature.

Fig. 4 is a plan, partly in section, of F ig. 3. Fig. 5 is irontelevation of a modification. Fig. 6 is a top view of. this modification. Fig. 7 is a front elevation of a magnetic i11- ductor having a rotary armature for the purpose of generating four current impulses at every revolution. Fig. 5% is a plan of Fig. 7.

Inthe magnetic inductor having an oscih' lating armature, shown in Fig. 1, 1 is the fixed coil which is held fast by means of the flanges 9 that are let into the pole pieces of the field magnets. This coil 1 is traversed along its longitudinal axis by the armature core 2 which is provided at top and bottom with journals 5 that are received. in the bearings 6, so that the armature core is capable of rotating about the axis of the coil.

To the ends of the armature core there are connected armature polefpieces each com posed of a part 3 which extends over the one end. of the coil, and of apart 4 which is bent at a right angle and is arranged along the coil and extending to the other end of the coil. One of the journals 5 is provided with a crank arm, which is however not shown in the drawing, for the purpose ofenabling the armature to be caused to oscillate. The pole pieces 7 of the steel magnet inclose almost completely the armature and the coil.

The mode of o eration of the magnetic ,in-. ductor is the wel known one, but the path of the lines of force is a peculiar one, namely as follows: The lines of force which are emitted by the north pole of the steel magnet, follow the iron of the armature, and by the fact that they pass in the armature core 2, they pass through the coil that is placed around said core, so that current impulses are induced in the coil by the oscillation of the armature.

' The eificiency. is increased by the fact, that in conse uence of the arrangement so made, almost a l the lines are collected-by the pole pieces 3 of the armature and a large number of turns with a minimum resistance is effected owin to the advantageous form of the coil. The anges 9 are cut away (see Fig. 2) for the purpose of facilitating the movement of the armature. only of one oscillatory motion of the armature because a ortion of the flanges 9 must always remain or the attachment of the coil.

In the magnetic inductor shown in Figs. 3

and 4 having a rotary armature, 1 is the coil which 1n this case is provided with a middle flange 10 for the purpose of attachment of the coil to the pole pieces of the steel magnet. In this arrangement therefore the end flanges can be cut away all round for the purpose of allowing the armature to rotate, in which case however these portions of the pole pieces of the armature which are arranged along the coil are not able to extend from one end to the other of the coil, but only as far as the middle flange 10. In an inductor of this kind two current impulses are produced at every revolution. But for certain purposes it is necessary to have four current impulses. This can be effected simply by making the armature with two more pole pieces which are arranged exactly opposite to the first pole pieces, as shown in Fi s 5 and 6. But this armature has the drawliack that it requires a complicated casing for the. pole pieces of the steel magnets, in order that the pole pieces of the armature shall not cause any direct magnetic short-circuiting between two field magnet poles of different polarity. The poles must be arranged in two pairs, the pairs set 90 apart and one pole of each pen atone end of the coil and the other at the other end of the coil, as shown.

A simple construction is obtained if as This construction allows shown in the magnetic inductor in Figs. 7 and 8, the pole pieces of the armature extending from one end of the core are shifted through an angle of 90 degrees. In this case the pole pieces of the steel magnet are no lon er situated diametrically opposite to each other, but are arranged in the chord of a square. By this means the construction of the pole pieces is very considerablysimplh lied. By increasing the number of the pole.

pieces of the armature and suitably arranging the positions of the same, anydesired increase in the number of current impulses per revolution can be obtained.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed I declare that What I claim is:

1. In a magnetic inductor, the combination With a permanent horseshoe magnet having enlarged. pole pieces; of a stationary coil included between said pole pieces, mov:

able core extending through the stationary coil and having ends extending over the ends of the coil and then along the sides thereof.

2. In a magnetic inductor the combination with a permanent magnethaving enlarged pole pieces; of a stationary coil mountl i l l eeaeas ed between and of less length than the polepieces, a rotatable core having ends extending over the ends of the coil and alon its sides, and means intermediate the ends ol the coil to support it from the pole pieces.

3. In a magnetic inductor, the combination With a'permanent horse-shoe magnet; of a stationary coil between the poles thereof, and a .movable core having a pair of extensions at each end passing over the ends of the coil and along its sides.

4. In a magnetic inductor, the combination with a pair of fixed magnetic poles; of a fixed coil between the poles, a movable core for said coil having Tshaped ends set at right angles to each other, said ends extending over the ends of thecoil and along its sides and arranged and adapted to simultaneously pass their respective poles whereby there will be produced in the coil alternation for each quarter revolution oi the core.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MARTIN FlSCIlEB.

\Vitn esses: A. LIEBERKNECHT, PAUL Vonnnonr. 

